Machine Design
Which process will increase the fatigue duration of parts?

De-carburisation
Finishing and polishing
Shot-peening
Electroplating

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the hole is 6 and for the shaft is 5
Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

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Machine Design
A hollow saddle key is

A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits half in the key way of hub and half in the key way of shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

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